On the recordSeptember 14, 1999
Yes, I agree with the Chairman of the Committee on Energy and Natural Resources. The Department of Energy has been investigating alternate fuels that would improve air emissions but not require a new infrastructure or delivery system such as would be required in the use of compressed natural gas. One possibility is Gas-to-Liquids or GTL. The GTL process takes natural gas and converts it to a liquid fuel that has the characteristics of diesel fuel, only without sulfur, which interferes with the catalysts that clean up emissions.
Source
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